If Japan takes action against North Korea the South will bomb Tokyo to the oblivion.
South Korea will not permit anyone and especially Japan to touch anything that belongs to Koreans. Koreans living in the NK are still citizens of SK and the land is claimed by SK.
Yes if there is conflict on the seas or in the air with the NK forces then SK will do nothing to stop the Japan.
What Japan did today/yesterday just pushed SK to be more assertive towards Japan. It hopefully speeds up the reunification.
Not an expert in the region but I'm pretty convinced SK has no real want to bomb Japan. And inversely, Japan wouldn't take action against the DPRK without it being a coordinated SK/US/JP effort.
The United States of America, the Republic of Korea, and Japan held a productive and substantive security meeting from April 16-17 in Washington, District of Columbia, to enhance trilateral defense cooperation in light of the evolving security environment in the region.... The officials reaffirmed that their governments will not accept North Korea as a nuclear-armed state, and agreed to closely coordinate to deter North Korean provocations.... In addition, the three countries held a productive discussion on cooperative measures for non-traditional security issues including humanitarian assistance and disaster relief, counter-piracy operations, and counter-ISIL efforts.[1]
Three years ago it was impossible to imagine the US and Iran co-operating about anything. Now the US has provided de facto aircover for Iranian operations against ISIS.
South Korea will not permit anyone and especially Japan to touch anything that belongs to Koreans. Koreans living in the NK are still citizens of SK and the land is claimed by SK.
Yes if there is conflict on the seas or in the air with the NK forces then SK will do nothing to stop the Japan.
What Japan did today/yesterday just pushed SK to be more assertive towards Japan. It hopefully speeds up the reunification.
DISCLAIMER: I am not korean.